MeSH is the U.S. National Library of Medicine's controlled vocabulary used for indexing articles for MEDLINE/PubMed. MeSH terminology provides a consistent way to retrieve information that may use different terminology for the same concepts.

Includes biographies and historical essays, primary source documents, reference books including the Funk & Wagnall's New World Encyclopedia; New Oxford American Dictionary, 2nd Edition; Encyclopedia of Animals™; and thousands of relevant photos, maps and flags.